Haven't looked into how to do this properly.
Fixes display initialization on the Acer Chromebook R13.
Reverts mediatek part of ebc9446135671b89c2397f438af45d9cef0d1368 ("drm: convert drivers to use drm_of_find_panel_or_bridge")
Signed-off-by: Ulrich Hecht ulrich.hecht+renesas@gmail.com --- drivers/gpu/drm/mediatek/mtk_dsi.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c index 7e5e24c..fd10cc4 100644 --- a/drivers/gpu/drm/mediatek/mtk_dsi.c +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c @@ -1093,6 +1093,7 @@ static int mtk_dsi_probe(struct platform_device *pdev) { struct mtk_dsi *dsi; struct device *dev = &pdev->dev; + struct device_node *remote_node, *endpoint; struct resource *regs; int irq_num; int comp_id; @@ -1105,10 +1106,22 @@ static int mtk_dsi_probe(struct platform_device *pdev) dsi->host.ops = &mtk_dsi_ops; dsi->host.dev = dev;
- ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, - &dsi->panel, &dsi->bridge); - if (ret) - return ret; + endpoint = of_graph_get_next_endpoint(dev->of_node, NULL); + if (endpoint) { + remote_node = of_graph_get_remote_port_parent(endpoint); + if (!remote_node) { + dev_err(dev, "No panel connected\n"); + return -ENODEV; + } + + dsi->bridge = of_drm_find_bridge(remote_node); + dsi->panel = of_drm_find_panel(remote_node); + of_node_put(remote_node); + if (!dsi->bridge && !dsi->panel) { + dev_info(dev, "Waiting for bridge or panel driver\n"); + return -EPROBE_DEFER; + } + }
dsi->engine_clk = devm_clk_get(dev, "engine"); if (IS_ERR(dsi->engine_clk)) {